Transaction authorization method

1. A method for authorizing a transaction, the method comprising: reading out a first code generated by a system for the transaction, by a first reader of a first mobile device, with the first code having been encrypted, reading out a second code, which is dedicated to the system and has at least one information item for decrypting the first code, the second code being read out by a second reader of the first mobile device, generating a first signature confirming the transaction by way of the system from the previously decrypted first code, transmitting the first signature to the system, and transmitting the first signature and a second signature identifying the system to a service facility in order to authorize the transaction.

2. The method according to claim 1 , wherein the first signature is generated in the first mobile device, in particular in a secure element of the first mobile device.

3. The method according to claim 1 , wherein the transmission of the first signature to the system is effected with the first mobile device and/or a second mobile device to which the first mobile device is connected via an over-the-air interface.

4. The method according to claim 3 , wherein the transmitting of the first signature to the system is effected via an over-the-air interface including a Bluetooth, wireless LAN, infrared and/or mobile radio interface.

5. The method according to claim 1 , wherein the service facility sends verification data confirming the execution of the transaction to a second mobile device.

6. The method according to claim 1 , wherein the first mobile device must be unlocked before readout such that the first mobile device must be unlocked by input of a password and/or by furnishing of a biometric authentication feature.

7. The method according to claim 1 , wherein the system is a point-of-sale system.

8. The method according to claim 1 , wherein the first code is a two-dimensional code including a secure QR code.

9. The method according to claim 1 , wherein the second code is an NFC code according to ISO 14443.

10. The method according to claim 1 , wherein the first mobile device is a watch, in particular a smartwatch.

11. The method according to claim 1 , wherein before the generating of the signature on the first mobile device transaction data are rendered on a display device of the first and/or the second mobile device.

12. The method according to claim 1 , wherein a smartwatch is used in the reading out of the first code and the reading out of the second code, the smartwatch including the first reader and the second reader.

13. The method according to claim 1 , wherein the system is a point-of-sale system that generates the first code generated for the transaction and the second code, wherein the point-of-sale system is dedicated to the system and has the at least one information item for decrypting the first code.